This table, is it in a database? And is it indicating the number of component, solder insp. etc based on one board or one panel? It needs to be based on the total number of inspection on your panelized pcb. The equation works, you may just be looking at the data wrong. Also, your data may be indicating the parameters for an inspection recipe. To get a true false call rate, you need the totals from all recipes and all boards. Check your reporting tool and make sure you are generating the proper report.